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If the wire for the switch and the bell that is in the existing conduit is carrying 110V, the answer is NO. You can not mix High & Low Voltage in the same conduit, so you will need to run an additional conduit to connect to the second set of terminals.
Is this for your residence or for a business? I question this as you are "playing with fire", in ...

If the modem is the only problem, replacing it might well solve the problem. As for finding a particular model of old modem at a non-outrageous price - ebay; sometime patience is needed for a very specific model or to get it at a non-absurd price, but generally modems are pretty cheap there.
Where the number is programmed - to be certain, you'd need a ...

I can't speak to the regulatory side of this, other than to say I'd be very surprised if a custom-built circuit like you're describing would pass an inspection just for the fact that it's a non-UL/CSA approved device on a life safety circuit. Being in a private residence at least will relax the requirements compared to a commercial or multi-tenant building, ...

HEMS, the vendor, answered my enquiry.
There is actually a clip (first image in the original question) with an arrow mark on it.
The problem is that the mark is uncoloured, very difficult to be noticed from where I stand.
Push the clip to the left to release the lock, then pull down the whole thing.

The system is designed to dial out on a phone line to a central station or a police monitoring system. These alarms have built in warnings for a failure in the phone line. This is a safeguard so you know the system is not working properly.
So long as the system is operational and cut off from the phone line, it will continue to beep. By removing parts of ...

Here's at least one for you:
http://firstalert.com/component/flexicontent/82-explosive-gas-co/929-plug-in-combination-explosive-gas-carbon-monoxide-alarm
I don't know why combination alarms are not more common. Maybe because natural gas has an odor added so it's readily apparent, unlike CO? There also aren't any dual smoke detector (ionizing and ...